| Patents Granted on 1939-03-?? |
Patents 1 -
15
of 27
      |
| Number | Date | Patentee | Title | Type |
| GB-501,631 | Mar. 02, 1939 | E.M. Erb | Improvements in Indexing Devices for Chucks and Other Work Holders | milling machine accessories |
| GB-501,911 | Mar. 07, 1939 | H.H. Asbridge | Improvements in variable speed drives in precision grinding machines | |
| 2,149,409 | Mar. 07, 1939 | F.D. Van Norman, B.F. Stowell, R.S. Pyne | Oscillating grinder | grinders |
| 2,149,940 | Mar. 07, 1939 | O. Kylin | Brake and Control Therefor | metalworking machine mechanisms |
| 2,149,964 | Mar. 07, 1939 | A. Hormel | Oil wiping machine | |
| CA-380,060 | Mar. 14, 1939 | H.G. Mueller | Meccanisme des Tiroirs de Machine a Vapeur | steam engine valve gear |
| 2,150,184 | Mar. 14, 1939 | G.F. Pearson | Screw holding screwdriver | screw starters |
| 2,150,561 | Mar. 14, 1939 | E. Reaney | Shankless Bit Holder and Clamp | lathe tool holders and tool posts |
| 2,150,621 | Mar. 14, 1939 | E.A. Hall | Pilot for Valve Seat Facing Tools | valve reseating tools |
| 2,150,688 | Mar. 14, 1939 | T.G. Louis | Magneto | ignition systems |
| 2,150,858 | Mar. 14, 1939 | G.K. Eggleston | Control Device | temperature controls |
| D113,860 | Mar. 21, 1939 | R.E. Wolfe, R.F. Kneisley | Design for a surfacing machine | sanding machines |
| 2,150,959 | Mar. 21, 1939 | R.H. Bergström | Tool Holder | lathe tool holders and tool posts |
| 2,151,189 | Mar. 21, 1939 | L. Coddington | Variable speed transmission mechanism | metal cutting bandsaws |
| 2,151,255 | Mar. 21, 1939 | E.J. Witchger | Spring Nut | |
